WFP Callout Driver Run-time Filtering Layer Identifiers (Compact 2013)

FWPS_LAYER_INBOUND_IPPACKET_V4

FWPS_LAYER_INBOUND_IPPACKET_V6

This filtering layer is located in the receive path, directly after the IP header of a received packet is parsed but before any IP header processing occurs. No IPsec decryption or reassembly has occurred.

FWPS_LAYER_OUTBOUND_IPPACKET_V4

FWPS_LAYER_OUTBOUND_IPPACKET_V6

This filtering layer is located in the send path directly before the sent packet is evaluated for fragmentation. All IP header processing is complete and all extension headers are in place. Any IPsec authentication and encryption has already occurred.

FWPS_LAYER_IPFORWARD_V4

FWPS_LAYER_IPFORWARD_V6

This filtering layer is located in the forwarding path at the point where a received packet is forwarded.

FWPS_LAYER_INBOUND_TRANSPORT_V4

FWPS_LAYER_INBOUND_TRANSPORT_V6

This filtering layer is located in the receive path directly after a received packet's header is parsed by the network stack at the transport layer, but before any transport layer processing occurs.

FWPS_LAYER_OUTBOUND_TRANSPORT_V4

FWPS_LAYER_OUTBOUND_TRANSPORT_V6

This filtering layer is located in the send path directly after a sent packet is passed to the network layer for processing but before any network layer processing occurs.

This filtering layer is located at the top of the network layer instead of at the bottom of the transport layer so that any packets that are sent by third-party transports or as raw packets are filtered at this layer.

FWPS_LAYER_STREAM_V4

FWPS_LAYER_STREAM_V6

This filtering layer is located in the stream data path. This layer allows for processing network data on a per stream basis. At the stream layer, the network data is bidirectional.

FWPS_LAYER_DATAGRAM_DATA_V4

FWPS_LAYER_DATAGRAM_DATA_V6

This filtering layer is located in the datagram data path. This layer allows for processing network data on a per datagram basis. At the datagram layer, the network data is bidirectional.

FWPS_LAYER_INBOUND_ICMP_ERROR_V4

FWPS_LAYER_INBOUND_ICMP_ERROR_V6

This filtering layer is located in the receive path for processing received ICMP messages for the transport protocol.

FWPS_LAYER_OUTBOUND_ICMP_ERROR_V4

FWPS_LAYER_OUTBOUND_ICMP_ERROR_V6

This filtering layer is located in the send path for processing sent ICMP messages for the transport protocol.

FWPS_LAYER_ALE_RESOURCE_ASSIGNMENT_V4

FWPS_LAYER_ALE_RESOURCE_ASSIGNMENT_V6

This filtering layer allows for authorizing transport port assignments, bind requests, promiscuous mode requests, and raw mode requests.

FWPS_LAYER_ALE_AUTH_LISTEN_V4

FWPS_LAYER_ALE_AUTH_LISTEN_V6

This filtering layer allows for authorizing TCP listen requests.

FWPS_LAYER_ALE_AUTH_RECV_ACCEPT_V4

FWPS_LAYER_ALE_AUTH_RECV_ACCEPT_V6

This filtering layer allows for authorizing accept requests for incoming TCP connections and for authorizing incoming non-TCP traffic based on the first packet received.

FWPS_LAYER_ALE_AUTH_CONNECT_V4

FWPS_LAYER_ALE_AUTH_CONNECT_V6

This filtering layer allows for authorizing connect requests for outgoing TCP connections and authorizing outgoing non-TCP traffic based on the first packet sent.

FWPS_LAYER_ALE_FLOW_ESTABLISHED_V4

FWPS_LAYER_ALE_FLOW_ESTABLISHED_V6

This filtering layer allows for notification when a TCP connection is established or non-TCP traffic is authorized.

FWPS_LAYER_IPSEC_KM_DEMUX_V4

FWPS_LAYER_IPSEC_KM_DEMUX_V6

This filtering layer determines which keying modules are invoked when the local system is the initiator. This is a user-mode filtering layer.

FWPS_LAYER_IKEEXT_V4

FWPS_LAYER_IKEEXT_V6

This filtering layer allows the IKE and authenticated IP modules to look up main-mode policy information when negotiating main-mode security associations. This is a user-mode filtering layer.

FWPS_LAYER_RPC_EPMAP

This filtering layer allows for inspecting the RPC data fields that are available in user mode during endpoint resolution. This is a user-mode filtering layer.

FWPS_LAYER_RPC_PROXY_CONN

This filtering layer allows for inspecting RpcProxy connection requests. This is a user-mode filtering layer.